Electron tube



Patented Aug. 27, 1940 UNITE s-Tars ELECTRON Edmund Liipp, Berlin, Germany, assignor to C. Lorenz Aktiengesellschaft, Berlin-Tempelhof,

Germany, a company Application January 12, 1939, Serial No. 250,489 In Germany December 23, 1937 3 Claims. (Cl. 250-275) In order to provide for predetermined distances between the electrodes of electron tubes it is customary to mount these electrodes on suitable carriers or supports made of mica or the like. As a rule, the electrodes are inserted in apertures of such support and are fastened therein by means of screws, rivets or the like, or the electrodes are formed with suitable extensions and by means of these are loosely seated in openings of the support. The latter construction has the disadvantage that the mutual distances of the electrodes can be influenced by shocks, whereas by fastening them the support is liable to destruction.

The invention aims to avoid these disadvantages. To such end the electrode system and support, which preferably is of a ceramic material, are secured together by a fusible material I and the rigid assembly so obtained is fastened within the vacuum vessel or the like. In this way the support will not be liable to destruction while the distances between the electrodes will be invariable.

One embodiment of the invention is illustrated in the accompanying drawing in which Fig. '1 shows a partially diagrammatic sectional view thereof, and Fig. 2 is a plan view thereof.

The device here represented is a so-called acorn tube having radial leads 2 embedded in an angularpress flange 6 of the vessel thereof. 3 denotes electrodes which are directly fixed to the leads 2 and are in this way carried by them. The

mutual distances of the electrodes are made in-' variable by a carrier or support 4 which preferably consists of a ceramic material capable of being outgassed. The electrodes aresecured in this support by the leads 2 having extensions inserted in suitableapertures 1 provided in support 5 d and having anenlargement for the reception of glass or other-fusible material 5. The material 5 is preferably of a higher melting point than the material from which the vessel 1 is made, so that the heat employed in embedding 1 theleads 2 in the flange 6 shall not affect the material 5. Fig. 2 more clearly shows the elec-- trode structures which comprises anode 8, grid 9, and cathode It. For convenience in wiring and to provide additional support to the member 15 4 the cathode leads are brought out on both sides of the tube.

What is claimed is: v

1. An electron tube comprising a vessel, an apertured support within said vessel, carrying 20 members fixed to said vessel at a point remote from said support and having their ends inserted in apertures in said support, fusible material fixing said carrying members to said support, and electrodes attached to said carrying 25 members between said point and said support.

2. An electron tube in accordance with claim 1 wherein said support is of ceramic material.

3. An electron tube in accordance with claim 1 wherein said support is of ceramic material and 30 said fusible material is glass.

EDMUND LGPP. 

